CN210322714U

CN210322714U - Geosynthetic material vertical permeameter

Info

Publication number: CN210322714U
Application number: CN201921042210.1U
Authority: CN
Inventors: 王刚; 王传凯
Original assignee: Shanghai Municipal Highway Engineering Testing Co Ltd
Current assignee: Shanghai Municipal Highway Engineering Testing Co Ltd
Priority date: 2019-07-03
Filing date: 2019-07-03
Publication date: 2020-04-14
Anticipated expiration: 2029-07-03

Abstract

The utility model discloses a geosynthetic material perpendicular infiltration appearance relates to geosynthetic material detection technical field, including the test bench, the top of test bench is fixed with infiltration room and L type proof box, the water inlet has been seted up in the infiltration room, the delivery port has been seted up in the L type proof box, one side of infiltration room is equipped with water level testing arrangement, be provided with the sample frame in the infiltration room, be provided with the overflow subassembly that is used for adjusting the overflow height in the infiltration room, the infiltration room is located L type proof box, the bottom of sample frame is provided with annular test room, the infiltration room has been seted up in annular test room department and has been permeated the mouth, L type proof box internal fixation has the breakwater, be connected with elevating system between sample frame and the L type proof box, be provided with waterproof component between annular test room and the infiltration room. There is the difficult problem of installing in the sample frame of sample to prior art, the utility model provides a geosynthetic material perpendicular permeameter has the advantage that makes things convenient for the staff to install the sample.

Description

Geosynthetic material vertical permeameter

Technical Field

The utility model relates to a geosynthetic material detects technical field, and more specifically says that it relates to a geosynthetic material perpendicular permeameter.

Background

Geosynthetics are a general term for synthetic materials used in civil engineering applications. As a civil engineering material, it uses artificially synthesized polymers (such as plastics, chemical fibers, synthetic rubber, etc.) as raw materials, and makes them into various products, and places them in the interior of soil body, on the surface of soil body or between various soil bodies so as to play the role of strengthening or protecting soil body. The geosynthetic material is a novel geotechnical engineering material, is internationally called as a fourth building material following three building materials of steel, cement and wood, is more and more widely applied along with the development of the basic construction of China, and for example, the permeability of geotextile or drainage board directly influences the quality of construction engineering.

For the existing geosynthetic material vertical permeameter, such as the chinese patent with the publication number CN206832637U, it discloses a vertical permeameter, which comprises a closed first box body, a permeation chamber, and a controller; the whole "L" shape that becomes of first box, its inside intercommunication side pipe, drain bar, wash port, inlet tube, drain pipe have, wherein intercommunication side pipe is in the left side of first box, the drain bar be in the right side of first box and have the clearance with first box top, the wash port is in one side of drain bar, the inlet tube is in the one side of intercommunication side pipe with the drain pipe, the infiltration room includes that one has an open-ended transparent infiltration section of thick bamboo, a flexible overflow section of thick bamboo, inlet opening, sample frame. The test principle is that a sample is fixed on a sample frame in a penetration chamber, water vertically penetrates through the sample by utilizing the water head principle, and the permeability of the sample under the hydraulic gradient is calculated by measuring the water permeability in unit time.

Among the above-mentioned perpendicular permeameter, because the infiltration room is darker and the position is higher, when the staff installed the sample on the sample frame, often need with the help of instruments such as ladder, and need the staff to stretch into the infiltration room with two arms are whole, because the degree of depth of infiltration room is close with adult's arm length usually, when the staff all stretched into the infiltration room with two arms and installed the sample, be difficult for the installation.

SUMMERY OF THE UTILITY MODEL

There is the difficult problem of installing in the sample frame of sample to prior art, the utility model aims at providing a geosynthetic material perpendicular permeameter, it has the advantage of making things convenient for the staff to install the sample.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a geosynthetic material perpendicular permeameter, includes the test bench, the top of test bench is fixed with infiltration room and L type proof box, the water inlet has been seted up in the infiltration room, the delivery port has been seted up in the L type proof box, one side of infiltration room is equipped with water level testing arrangement, be provided with the sample frame in the infiltration room, be provided with the overflow subassembly that is used for adjusting the overflow height in the infiltration room, the infiltration room is located on the L type proof box, the bottom of sample frame is provided with the annular test room, the infiltration room in the infiltration mouth has been seted up to annular test room department, L type proof box internal fixation has the breakwater, the sample frame with be connected with elevating system between the L type proof box, the annular test room with be provided with waterproof component between the infiltration room.

Through above-mentioned technical scheme, in the in-service use, when the staff need install the sample, promote sample frame and annular laboratory through elevating system for the sample frame is close to the opening of infiltration room more, makes things convenient for the staff to install the sample on the sample frame, and the position when installing back rethread elevating system with sample frame and annular laboratory decline to the experiment begins the experiment. The waterproof assembly is used for preventing water flow in the infiltration chamber from entering the L-shaped test box from a gap between the annular test chamber and the bottom of the infiltration chamber.

Furthermore, the lifting structure comprises at least three electric push rods distributed in a circumferential array and a guide assembly.

Through above-mentioned technical scheme, the guide assembly is used for playing the guide effect when electric putter produces the lift, and restriction electric putter's moving direction is more stable when guaranteeing electric putter and rising and descend, and electric putter realizes the lift of sample frame as elevating system's power.

Furthermore, the sample frame and the L-shaped test box are fixedly connected at the electric push rod through a connecting component.

Through above-mentioned technical scheme, in the practical application, coupling assembling is with electric putter fixed connection on sample frame and L type proof box for electric putter can be used in the use on the sample frame, thereby realizes raising and lowering functions.

Further, the direction subassembly includes a telescopic cylinder and a telescopic link, the telescopic cylinder is fixed the sample frame is close to one side of L type proof box, the one end of telescopic link is fixed in the L type proof box, the other end slide in vertical direction and connect in the telescopic cylinder.

Through above-mentioned technical scheme, in the in-service use, when electric putter goes up and down, the displacement also takes place along with the sample frame for a telescopic cylinder, plays the guide effect to electric putter's moving direction, prevents simultaneously that electric putter from receiving the effort of direction except vertical in the use, leads to electric putter to damage, if electric putter also at least one can use, just can realize the lift of sample frame, avoids changing electric putter immediately, the cost time for the experiment delays.

Further, waterproof subassembly includes first waterproof circle and second waterproof circle, and first waterproof circle is fixed at the infiltration mouth edge of infiltration room bottom, and the one end of keeping away from the sample frame in annular laboratory is fixed to the waterproof circle of second.

Through above-mentioned technical scheme, in the in-service use, penetration test is calculated through the infiltration water yield that water permeates the sample, and the inseparable laminating of first waterproof circle and second prevents that rivers from getting into L type proof box between annular test room and the infiltration room bottom for test data is more accurate.

Further, the lower end of the first waterproof ring is thicker than the middle and the upper end, and the lower end of the second waterproof ring is thinner than the middle and the upper end.

Through above-mentioned technical scheme, in the in-service use, when the staff fixed the sample, electric putter drops to when first waterproof circle and the waterproof circle of second begin to contact, the inclined plane of first waterproof circle and the waterproof circle of second becomes the direction for first waterproof circle and the waterproof circle of second can be inseparable laminating together, prevent that waterproof circle warp and lead to water to get into in the L type proof box, influence experimental data.

Furthermore, the overflow assembly comprises a telescopic overflow cylinder arranged in the infiltration chamber, a lifting support is fixed on the telescopic overflow cylinder, and a screw rod is arranged on one side of the lifting support.

Through the technical scheme, in practical application, the overflow assembly is used for guiding the overflowed water source out of the instrument, and the telescopic overflow cylinder moves up and down to guide the water source higher than the water source in the telescopic overflow pipe out; the screw rod is used for driving the lifting support to move, and the lifting support moves to drive the telescopic overflow cylinder to move together, so that the overflow function is realized.

Furthermore, a constant temperature water tank used for keeping the water temperature is arranged on one side of the test bed, a water outlet pipe of the constant temperature water tank is connected with a water inlet of the test bed, and a water inlet pipe of the constant temperature water tank is connected with a water outlet of the test bed.

Through the technical scheme, in the practical application, the constant-temperature water tank is used for providing a water source with proper temperature for the test, and water after the test returns to the constant-temperature water tank for cyclic utilization and resource saving.

Compared with the prior art, the beneficial effects of the utility model are that:

(1) through the matching of the electric push rod and the guide assembly, the sample rack can be lifted, so that workers can fix the sample on the sample rack conveniently for testing;

(2) furthermore, through the arrangement of the waterproof assembly, water in the permeation chamber is prevented from entering the L-shaped test box to influence test data;

(3) further, the water pressure of the permeation chamber is controlled by the overflow assembly, so that a worker can measure more accurate data.

Drawings

FIG. 1 is a schematic view of the overall structure of the present embodiment;

FIG. 2 is a schematic structural view showing the internal structure of a permeation chamber and an L-shaped test chamber;

FIG. 3 is a cross-sectional view of the sample holder taken along the plane A-A of FIG. 1 at the lowest position;

FIG. 4 is a cross-sectional view of the sample holder taken along the plane A-A of FIG. 1 at the uppermost position;

FIG. 5 is an enlarged view of portion B of FIG. 3;

fig. 6 is an enlarged view of the portion C in fig. 4.

Reference numerals: 1. a water supply system; 11. a constant temperature water tank; 12. a water inlet pipe; 13. a water outlet pipe; 2. a permeate chamber; 21. a barrel; 22. an annular laboratory; 221. an annular groove; 222. a penetration opening; 23. a sample holder; 231. a permeable stone; 2311. the upper layer is permeable stone; 2312. a lower layer of permeable stone; 232. an adjusting ring; 233. a limiting vertical rod; 234. a limiting cross bar; 235. a limiting pressure spring; 24. a waterproof assembly; 241. a first waterproof ring; 2411. a first vertical portion; 2412. a first transverse connecting portion; 2413. a second vertical portion; 2414. a first groove; 2415. a second groove; 2416. a first ridge; 2417. a second ridge; 242. a second waterproof ring; 2421. a third vertical portion; 2422. a second transverse connecting portion; 2423. a fourth vertical portion; 2424. a third groove; 2425. a fourth groove; 2426. a third ridge; 2427. a fourth ridge; 25. a water inlet; 26. a first communication pipe; 3. an L-shaped test chamber; 31. a box body; 32. a water baffle; 33. a water outlet; 4. a test bed; 5. an overflow assembly; 51. a telescopic overflow cylinder; 52. a second communicating pipe; 53. lifting the support; 54. a first screw base; 55. a second screw base; 56. a screw; 57. a hand wheel; 6. a water level testing device; 61. a first water level scale pipe; 62. a second water level scale pipe; 63. a U-shaped pipe; 7. a lifting mechanism; 71. an electric push rod; 72. a guide assembly; 721. a telescopic cylinder; 722. a telescopic rod; 73. a connecting assembly; 731. connecting the ear plates; 732. and (6) positioning the bolt.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the following provides a further detailed description of the present invention with reference to the following embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

A geosynthetic material vertical permeameter, as shown in FIGS. 1 and 2, includes a water supply system 1 for supplying water to a test, a permeation chamber 2 for the permeation test, an L-shaped test chamber 3 for temporarily storing the amount of permeation water, a test bed 4 for housing the permeation chamber 2 and the L-shaped test chamber 3, an overflow assembly 5 for securing the water pressure of the permeation chamber 2, a water level measuring device for measuring the water levels of the permeation chamber 2 and the L-shaped test chamber 3, and a lifting mechanism 7 for lifting and lowering a sample (see FIG. 4).

As shown in fig. 1, the water supply system 1 includes a constant temperature water tank 11 arranged on one side of the test bed 4, a water outlet pipe 13 is communicated with the top of the constant temperature water tank 11, one end of the water outlet pipe 13, which is far away from the constant temperature water tank 11, is communicated with the infiltration chamber 2 for providing a water flow with a proper temperature for the infiltration test, an inlet pipe 12 is communicated with one side of the constant temperature water tank 11, which is close to the test bed 4, and one end of the inlet pipe 12, which is far away from the constant temperature water.

As shown in fig. 1 and 6, the infiltration chamber 2 is installed on the L-shaped test box 3, the infiltration chamber 2 includes a cylindrical barrel 21, the barrel 21 is made of transparent material, an annular test chamber 22 and a sample holder 23 arranged at the top of the annular test chamber 22 are arranged in the barrel 21, and an annular groove 221 is formed at the top of the annular test chamber 22 for installing the sample holder 23; the bottom of the infiltration chamber 2 is provided with an infiltration port 222 (see fig. 3) for infiltration test at the position of the annular test chamber 22; the sample frame 23 comprises a permeable stone 231, the permeable stone 231 comprises an upper layer permeable stone 2311 and a lower layer permeable stone 2312 which are arranged in parallel, and the bottom of the sample frame 23 is detachably connected with the annular test chamber 22; the lateral wall threaded connection of annular laboratory 22 has adjusting ring 232, the internal diameter of adjusting ring 232 is the same with annular laboratory 22's external diameter, and can rotate at annular laboratory 22's lateral wall, make it produce the displacement along vertical direction, the top side symmetry of adjusting ring 232 is fixed with two spacing montants 233, the top of spacing montant 233 is fixed with spacing horizontal pole 234, the one end butt that spacing montant 233 was kept away from to spacing horizontal pole 234 has spacing pressure spring 235, the bottom side butt of spacing pressure spring 235 connects the top of upper strata permeable stone 2311231.

During the use, the sample is fixed between upper permeable stone 2311 and lower floor permeable stone 2312, rotates adjustable ring 232 downwards, drives spacing montant 233 and spacing horizontal pole 234 and moves down, and spacing horizontal pole 234 compresses tightly spacing pressure spring 235 for upper permeable stone 2311, sample and the inseparable fixed of lower floor permeable stone 2312 are in the same place.

As shown in fig. 2 and 5, the infiltration chamber 2 further includes a waterproof assembly 24, the waterproof assembly 24 includes a first waterproof ring and a second waterproof ring 242, both the first waterproof ring and the second waterproof ring 242 are made of rubber material, the first waterproof ring 241 is detachably connected to the edge of the infiltration port 222, the second waterproof ring 242 is detachably connected to one side of the annular test chamber 22 away from the sample holder 23, the first waterproof ring 241 includes a first vertical portion 2411, a first transverse connection portion 2412 and a second vertical portion 2413, the bottom end of the first vertical portion 2411 is fixedly connected to one end of the first transverse connection portion 2412, the other end of the first transverse connection portion 2412 is fixedly connected to the top end of the second vertical portion 2413, and the bottom end of the second vertical portion 2413 is thicker than the top end of the second vertical portion 2413; the outer side of the first waterproof ring 241 is provided with a first groove 2414 at the first vertical portion 2411, a second groove 2415 at the second vertical portion 2413, a first convex edge 2416 fixed at the first groove 2414 of the infiltration chamber 2, and a second convex edge 2417 fixed at the second groove 2415.

The second waterproof ring 242 includes a third vertical portion 2421, a second cross connecting portion 2422 and a fourth vertical portion 2423, a bottom end of the third vertical portion 2421 is fixedly connected with one end of the second cross connecting portion 2422, the other end of the second cross connecting portion 2422 is fixedly connected with a top end of the fourth vertical portion 2423, and the bottom end of the fourth vertical portion 2423 is thinner than the top end of the third vertical portion 2421; the inner side of the second waterproof ring 242 is provided with a third groove 2424 on the third vertical portion 2421, a fourth groove 2425 on the fourth vertical portion 2423, a third protrusion 2426 is fixed on the third groove 2424 of the annular test chamber 22, a fourth protrusion 2427 is fixed on the fourth groove 2425, and the inner side of the first waterproof ring 241 is completely attached to the outer side of the second waterproof ring 242.

As shown in fig. 3, the infiltration chamber 2 further includes a water inlet 25 provided at the bottom of the cylinder 21, the water inlet 25 is communicated with a first communication pipe 26, and one end of the first communication pipe 26 far away from the water inlet 25 is communicated with the water outlet pipe 13 of the constant temperature water tank 11.

As shown in fig. 1 and 2, L type proof box 3 is installed on the laboratory bench, and L type proof box 3 includes box 31, and the top of box 31 sets up annular opening, and the lateral wall of box 31 marks the scale, and the inside of box 31 is fixed with breakwater 32, leaves the space between breakwater 32's top and the L type proof box 3, and one side of keeping away from infiltration room 2 in the box 31 has seted up delivery port 33 (refer to fig. 3), and delivery port 33 communicates with inlet tube 12 of constant temperature water tank 11.

As shown in fig. 1 and 3, the overflow assembly 5 includes a telescopic overflow cylinder 51 disposed in the infiltration chamber 2, a second communication pipe 52 is fixed to a bottom end of the telescopic overflow cylinder 51, the second communication pipe 52 is located in the L-shaped test chamber 3, and a bottom end of the second communication pipe 52 is communicated with the water inlet pipe 12 of the constant temperature water tank 11, so that the overflowing water flow can enter the constant temperature water tank 11, and the water flow is prevented from entering the L-shaped test chamber 3, thereby increasing test errors; a lifting support 53 is arranged on the outer side of the infiltration chamber 2, the lifting support 53 is in an inverted U shape, one vertical rod of the lifting support 53 is fixed at the top end of the telescopic overflow cylinder 51, the other vertical rod is arranged on one side of the infiltration chamber 2 far away from the L-shaped test box 3, and a first screw rod seat 54 is fixedly sleeved on the other vertical rod; the test bench 4 is fixed with the second screw rod seat 55 below the first screw rod seat 54, and the promotion support 53 wears to establish and slides in the second screw rod seat 55, and the top side of second screw rod seat 55 is rotated and is connected with screw rod 56, and screw rod 56 threaded connection wears to establish first screw rod seat 54, and the top of screw rod 56 is fixed with hand wheel 57.

As shown in fig. 2, the water level testing device 6 is fixed on the L-shaped test box 3 and is close to one side of the lifting bracket 53, the water level testing device 6 comprises a first water level scale pipe 61 communicated with the L-shaped test box 3, and the first water level scale pipe 61 is higher than the top of the water baffle 32; and the second water level graduated tube 62 is communicated with the bottom of the infiltration chamber 2, the second water level graduated tube 62 is communicated with the bottom of the infiltration chamber 2 through a U-shaped tube 63, and the second water level graduated tube 62 is higher than the first water level graduated tube 61 and is flush with the infiltration chamber 2.

As shown in fig. 4 and 5, the lifting mechanism 7 includes four electric push rods 71 arranged circumferentially and a guide assembly 72 located at the center of the four electric push rods 71, the guide assembly 72 includes a telescopic tube 721 fixed at the bottom of the lower permeable stone 2312 and a telescopic rod 722 fixed at the bottom of the L-shaped test box 3, the telescopic tube 721 is sleeved with the telescopic rod 722, and the guide assembly 72 serves as the guide of the electric push rods 71, so that the electric push rods 71 can move in the vertical direction, thereby realizing the lifting of the sample rack 23; the electric push rod 71 is fixedly connected through a connecting assembly 73, one end of the electric push rod is fixed at the bottom of the lower-layer permeable stone 2312, the other end of the electric push rod is fixed at the bottom of the L-shaped test box 3, the connecting assembly 73 comprises a connecting lug plate 731 and a positioning bolt 732, the positioning bolt 732 penetrates through the connecting lug plate 731 and the electric push rod 71 to fixedly connect the connecting lug plate 731 and the electric push rod 71, and the connecting lug plate 731 is fixed at the bottom of the lower-layer permeable stone 2312 and the bottom of the L. The lowest position of the sample holder 23 is lower than the top of the water guard 32.

When a worker installs or detaches a sample, the sample frame 23 and the annular test chamber 22 are lifted through the electric push rod 71, the lower adjusting ring 232 is taken firstly, meanwhile, the limiting vertical rods 233, the limiting transverse rods 234 and the limiting pressure springs 235 are taken down together, the upper permeable stone 2311 is taken down, the sample is installed on the top of the lower permeable stone 2312 or the bottom of the upper permeable stone 2311, the upper permeable stone 2311 is installed back to the top of the lower permeable stone 2312, the adjusting ring 232 is installed and the like, and the sample frame 23 and the annular test chamber 22 are lowered through the electric push rod 71; when the second waterproof ring 242 is lowered to be in contact with the first waterproof ring 241, the first waterproof ring 241 and the second waterproof ring 242 can be completely attached through the arrangement of the second vertical portion 2413 and the fourth vertical portion 2423, so that water in the infiltration chamber 2 cannot flow through the space between the first waterproof ring 241 and the second waterproof ring 242 to enter the annular test chamber 22 during infiltration test.

When in use, a sample is put into the infiltration chamber 2, then water with the temperature of 18-22 ℃ in the constant-temperature water tank is injected into the infiltration chamber 2, the water levels of the infiltration chamber 2 and the L-shaped test box 3 are respectively observed through the first water level scale pipe 61 and the second water level scale pipe 62, and the balance is carried out for 5min after the water level difference reaches 50 mm; carrying out an infiltration test, wherein water flow in the infiltration chamber 2 enters the annular test chamber 22 through the sample frame 23 and the sample, then flows into the L-shaped test box 3, collects the amount of infiltration water more than 1000ml for at least 30s, and records the corresponding amount of infiltration water and time after the requirements are met; if the water amount in the infiltration chamber 2 is too much, the water amount is reduced through the overflow assembly 5 when the water pressure in the infiltration chamber 2 is too high, and the water flow enters the constant-temperature water tank 11 through the second communicating pipe 52 and the water inlet pipe 12, so that the cyclic utilization is realized, and the water resource is saved; when the water amount of the water baffle 32 in the L-shaped test box 3 close to one side of the infiltration chamber 2 is excessive, water flow bypasses the water baffle 32, enters one side of the water baffle 32 in the L-shaped test box 3 far away from the infiltration chamber 2, flows into the constant temperature water tank 11 through the water outlet 33 and the water inlet pipe 12, and realizes the recycling of water resources; when the sample is mounted and dismounted, the lifting mechanism 7 is convenient for workers to operate.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The geosynthetic material vertical permeameter comprises a test bed (4), wherein a penetration chamber (2) and an L-shaped test box (3) are fixed at the top end of the test bed (4), a water inlet (25) is formed in the penetration chamber (2), a water outlet (33) is formed in the L-shaped test box (3), a water level testing device (6) is arranged on one side of the penetration chamber (2), a sample rack (23) is arranged in the penetration chamber (2), an overflow assembly (5) for adjusting the overflow height is arranged in the penetration chamber (2), the penetration chamber (2) is positioned on the L-shaped test box (3), an annular test chamber (22) is arranged at the bottom of the sample rack (23), a penetration opening (222) is formed in the position of the annular test chamber (22) of the penetration chamber (2), and a water baffle (32) is fixed in the L-shaped test box (3), the device is characterized in that a lifting mechanism (7) is connected between the sample frame (23) and the L-shaped test box (3), and a waterproof assembly (24) is arranged between the annular test chamber (22) and the infiltration chamber (2).

2. The geosynthetic vertical permeameter of claim 1, wherein the lift mechanism comprises at least three circumferentially arrayed electrically powered push rods (71) and a guide assembly (72).

3. The geosynthetic material vertical permeameter of claim 2, wherein the sample holder (23) and the L-shaped test box (3) are both fixedly connected at the electric push rod (71) by a connection assembly (73).

4. The geosynthetic material vertical permeameter of claim 2, wherein the guide assembly (72) comprises a telescopic tube (721) and a telescopic rod (722), the telescopic tube (721) is fixed on one side of the sample frame (23) close to the L-shaped test chamber (3), one end of the telescopic rod (722) is fixed in the L-shaped test chamber (3), and the other end of the telescopic rod is connected in the telescopic tube (721) in a sliding manner in a vertical direction.

5. Geosynthetic material vertical permeameter of claim 1, wherein the waterproof assembly (24) comprises a first waterproof ring (241) and a second waterproof ring (242), the first waterproof ring (241) being fixed to the edge of the permeation opening (222) at the bottom of the permeation chamber (2), and the second waterproof ring (242) being fixed to the end of the annular test chamber (22) remote from the sample holder (23).

6. The geosynthetic vertical permeameter of claim 5, wherein the first waterproof ring (241) has a lower end that is thicker than the middle and upper ends, and the second waterproof ring (242) has a lower end that is thinner than the middle and upper ends.

7. The geosynthetic material vertical permeameter of claim 1, wherein the overflow assembly (5) comprises a telescopic overflow cylinder (51) arranged in the infiltration chamber (2), wherein a lifting bracket (53) is fixed on the telescopic overflow cylinder (51), and a screw (56) is arranged on one side of the lifting bracket (53).

8. The geosynthetic material vertical permeameter of claim 1, wherein a constant temperature water tank (11) for maintaining water temperature is arranged at one side of the test bed (4), a water outlet pipe (13) of the constant temperature water tank (11) is connected with a water inlet (25) of the test bed (4), and a water inlet pipe (12) of the constant temperature water tank (11) is connected with a water outlet (33) of the test bed (4).